Improvement in motors for sewing-machines



G. R. EVERSON.

Motor for Sewing-Machines, N0. l64,439 Patentedlune15,l875.

IIHIIIIII I llllllll THE GRAPHIC COAPHOTD-LITHJQ A41 PARK PLACE,N-Y.

UNITED. STATES.

PATENT- OFFICE.

. GEORGE R. EvEEsoN, oncrnolnnnrr, orno.

IMPROVEMENT lN .MOTORS FOR. SEWING-MACHINES.

Specification forming part of Letters Patent No. 164,439,- dated June15, 1875; application filed January .5, 1875.

To all whom it may concern:

Be it known that I, GEORGE ROTUS EVER- 'SON, a resident of the city ofCincinnati, in

the State of Ohio, have invented certain new and useful Improvements inMotors for Operating Sewing-Machines Independent of Treadle, Hand, orFoot Power, of which the following is a specification:

My invention relates to a device for the impartation of mechanical powerfor running or operating sewing-machines, and its intention,application, and purpose are particularly to avoid and supersede thereciprocating treadlemovement now in use to impart motion to saidmachines. My invention also dispenses with the necessity of thecontinual foot and hand movement now used.

My device, in general, consists of the combination of alever and twopawls and a ratchetwheel operated by a spring or cord and weight,

or by both, the pawls engaging the teeth in the,

same side of the latter. The pawls cross each other in their line ofoperation, and in this way produce a more uniform movement than whenthey operate parallel with each other, as is the case with all motors ofthis description heretofore patented. The ratchet-wheel causes the pawlsto communicate a reciprocating motion to the lever, the latter thenbeing capable of operating a crank or pitman, and thus imparting rotaryor linear reciprocating motion to each machine,as they come within thescope of this invention.

In the accompanying drawing making part of this specification, Figure 1represents my improved device and one end of a sewing-machine, andshowing one mode of combining said device with the upper operating-shaftof a sewing-machine. Fig. 2 represents portionsof the shaft, the motor,ratchet-wheel, and the subordinate ratchet,whieh at all times preventsthe motor ratchet-wheel from retrograding. Fig. 3 represents that edgeof my device which is on the right-hand side in Fig. 4, the lever whichis immediately actuated by the pawls having been removed; and Fig. 4represents that side of my device which. is the reverse of that partlyshown in Fig. 2.

A represents a shaft, which is supported,

preferably at a, in journal-bearings, so that.

it is held securely in position and is capable-of rotation. When myimproved device is attached to sewing-machines one of the journal boxesor bearings whereby the shaft A is supported is preferably placed in theframe of the legs 13, as shown in Fig. 1. O designates the motorratchet-wheel, turning upon shaft A between the collars D D. The latterare tightly fixed upon the shaft, preferably by means of set-screws d,as thereby the collars can be adjusted on the shaft. Collar D isprovided with v a ratchet-wheel, E, the collar and wheel beingconcentric. A pawl, F, pivoted to the motorshaft wheel 0, engages theteeth of the ratchetwheel A, and prevents any retrograde movement of thelatter. A flat spring, 6, fastened to the inside of the ratchetwheel A,presses upon the back of the pawl F, and holds the latter in positionupon the ratchet E. A coiled spring is attached at one end of the shaftA, and at the other to the ratchet-wheelG, in such a manner that, byturning the shaft A in a different direction to that in which the teethof the ratchet-wheel point, the spring shall be wound up, the ratchet Eand pawl F preventing the spring from unwinding any faster than theratchet-wheel O can move, and arm Gr extending from the same frameworkwhich supports shaftA to the right of the ratchet-wheel G, a distancesufficient to properly support the reciprocating lever H and afford roomfor the necessary action of the reciprocating pawls I and J. Pawl I ispivoted to the lever H above the point 17, where the lever H is pivotedto the arm Gr, and pawl J is pivoted to the lever H below the point i.The pawls are prevented from dropping down and away from theratchetwheel by means of a bearing, K, connected to the frame-work whichsupports the shaft A. The lever H is preferably connected to one end ofa pitman or connecting-rod, L, whose other end is attached to a crank orfly wheel, M, which latter turns the shaft which operates the machine.To secure a more steady and uniform motion of the lever H, its lever endis provided with a weight, N, which can be adjusted upon the lever H bymeans of a set-screw, n.

It is well to remark that my invention is not confined to thereciprocating pawls of the precise shape of those shown in the drawing,but includes pawls of any shape. acting upon one and the same side ofthe ratchet-wheel and pivoted to the reciprocating lever, the one aboveand the other below the point i, whereat the lever is pivoted.

In relation to the motor-power, I do not confine myself to theemployment of a spring, but propose to use, where more convenient, aweight and cord, thelatter beingwound upon the'shaft A, where the springis now placed.

The modem which my device .is operated is as follows: The operator windsup the spring P by means of a hand-crank attached to the shaft A at thepoint e, the pawl F preventing the spring P from unwinding. The effortof the spring to unwind moves the ratchet-wheel O alternately againstthe pawls I and J, and thus imparts a reciprocating oscillatory movementto levers H. The movement of the latter iscolnmunicated, in turn, to theconnectingrod L, which latter turns the crank or fly wheel M, which inturn rotates the shaft operating the machine to which my device isapplied. The rapidity of the-oscillation of lever H can be regulated insome degree by the weight N.

The nearer the weight is set to the point i the more rapidly will thelever H oscillate, and vice versa. The weight, however, is notabsolutely essential to the effective operation of my device.

The crank or fly wheel N may be directly connected to the end of thelever H, without the intervention of the connecting-rod L; but

